Due to the angle at which the optic nerve enters the brain, staring at a blue surface during sex greatly increases the intensity of orgasms.
252
Tigers can see 6 times better at night than humans.
305
Only 12,000 years ago there was a species closely related to modern humans called Homo floresiensis that had been living on an Indonesian Island. They used fire and rather advanced tools, yet were only about 3 feet tall and weighed around 25kg.
15
It took 200,000 years for humans to reach 3 billion in number. It took 40 years for the next 3 billion.
11
In ancient Egypt, priests plucked EVERY hair from their bodies, including their eyebrows and eyelashes.
130
It takes twice as long to lose new muscle if you stop working out than it did to gain it.
127
The world's shortest man measures only 21.5 inches.
73
The average sperm cell swims at 8 inches per hour.
4